body {
    padding: 15px;
    background-color: #f2f3f5;
}

.cover-box {
    display: flex;
}

.left-cover {
    width: 400px;
    height: 400px;
    margin-right: 20px;
}

.left-cover img {
    width: 100%;
}

.right-cover {
    text-align: center;
}

.preview-cover {
    width: 200px;
    height: 200px;
    background-color: #ccc;
    margin-bottom: 20px;
    overflow: hidden;
}